Mixing is an indispensable production process in modern industry. With the continuous development of the world industry, the development of mixing systems and mixing equipment will become more and more powerful.
Mixing covers the entire industrial field, such as chemicals, food, building materials, pharmaceuticals, fertilizers, and the products we use every day and every hour have at least one mixing process in the production.
Overview of Mixers
The mixer function can be divided into physical mixing and chemical auxiliary mixing. Physical mixing is purely a single stirring effect. Two or more materials are stirred to produce a mixture. Chemical-assisted mixing means that physical action is accompanied by chemical reaction, mainly to do sufficient chemical reaction, and physical mixing makes the contact between materials more comprehensive.
Mixing includes artesian mixing and mechanical mixing. Self-flow mixing refers to the movement between materials, and the final uniform mixing is achieved through self-friction; mechanical mixing refers to the final uniform mixing of materials through mechanical force. Generally, gas mixing is artesian mixing; three-dimensional mixing equipment is a combination of artesian mixing and mechanical mixing; all mixing in which the mixing container does not move is mechanical mixing.
Mixing uniformity: analyze the physical quantity of the quality of the material, and obtain it through probability theory. The mixing uniformity is determined by the type of mixing equipment.
Dead angle: refers to the physical phenomenon that materials cannot participate in mixing in the mixing container. The percentage of dead angle is a physical quantity to evaluate the quality of mixing equipment.
Mixing time: The physical quantity for evaluating the mixing speed, which refers to the time from the start of mixing of different materials until the mixing reaches the required uniformity. The mixing time is determined by the type and model of the mixing equipment.
Selection of the type of dry powder mixing equipment
There are many types of dry powder mixing equipment. This article mainly analyzes the commonly used equipment in the market: Ribbon mixer, Paddle mixer and V-type mixer:
The mixing space is in the form of a U-shaped drum, and there is an integral screw shaft in the barrel. The motor reducer is located on the end face of the main equipment.
The mixing is relatively stable, and the damage to the crystal is small.
When the equipment is mixed, all materials are in an overall motion state, and the power requirements are high.
The mixing time is relatively short.
It has a wide range of applications. It can mix powder and powder, powder and liquid. It can spray a large amount of liquid into the material during mixing. During the whole process of mixing, the material can be either solid powder or sticky.
In particular, it can stir paste-like, viscous or heavy materials (such as putty, real stone paint, metal powder, etc.).
It is widely used in pharmaceutical, food, pesticide, dye, chemical, plastic, ceramic, paint, putty, mortar and other fields.
The mixer has high mixing uniformity, fast mixing speed, no segregation during mixing, no dead angle, no deposition, no overheating of heat-sensitive materials, no pressure feeding and grinding of particles, and small deviation compared to mixing uniformity. .
The material is discharged from the bottom of the barrel, with manual and pneumatic open doors, fast discharging and good sealing performance.
At the same time, the device coefficient is large, the floor area is small, the size is suitable, and the use, maintenance and cleaning are relatively convenient.
V-type mixer series products are high-efficiency asymmetric mixers, which are suitable for mixing powder or granular materials in chemical, food, medicine, feed, ceramics, metallurgy and other industries. The machine has reasonable and simple structure, airtight operation, convenient feeding and discharging, (manual or vacuum feeding) cylinder is made of stainless steel material, which is easy to clean, and is one of the basic equipment of the enterprise.
It is suitable for the mixing of powders and granules with good fluidity and small physical property difference, as well as the mixing of materials that do not require high mixing degree but require short mixing time. Because the material in the V-shaped mixing container flows smoothly, it will not destroy the original shape of the material. Therefore, the V-type mixer is also suitable for the mixing of granular materials that are easily broken and easy to wear, or the mixing of finer powder, block, and materials containing a certain amount of water. It is widely used in pharmaceutical, chemical, food and other industries.